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123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
#pragma once
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/*
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* Copyright (c) 2013-2015, Roland Bock
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdexcept>
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#include <string>
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#include <ciso646>
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namespace sqlpp
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{
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static constexpr bool quiet_auto_rollback = false;
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static constexpr bool report_auto_rollback = true;
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enum class isolation_level
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{
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undefined, // use the current database default
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serializable, // highest level, stronguest guarantee
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repeatable_read, // DBMS holds read and write locks
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read_committed, // DMBS holds read locks, non-repeatable reads can occur
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read_uncommitted // lowest isolation level, dirty reads may occur
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};
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template <typename Db>
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class transaction_t
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{
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Db& _db;
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const bool _report_unfinished_transaction;
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bool _finished = false;
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public:
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transaction_t(Db& db, bool report_unfinished_transaction)
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: _db(db), _report_unfinished_transaction(report_unfinished_transaction)
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{
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_db.start_transaction();
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}
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transaction_t(Db& db, bool report_unfinished_transaction, isolation_level isolation)
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: _db(db), _report_unfinished_transaction(report_unfinished_transaction)
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{
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_db.start_transaction(isolation);
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}
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transaction_t(const transaction_t&) = delete;
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transaction_t(transaction_t&& other)
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: _db(other._db), _report_unfinished_transaction(other._report_unfinished_transaction), _finished(other._finished)
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{
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other._finished = true;
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}
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transaction_t& operator=(const transaction_t&) = delete;
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transaction_t& operator=(transaction_t&&) = delete;
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~transaction_t()
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{
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if (not _finished)
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{
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try
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{
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_db.rollback_transaction(_report_unfinished_transaction);
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}
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catch (const std::exception& e)
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{
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_db.report_rollback_failure(std::string("auto rollback failed: ") + e.what());
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}
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catch (...)
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{
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_db.report_rollback_failure("auto rollback failed with unknown exception");
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}
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}
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}
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void commit()
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{
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_finished = true;
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_db.commit_transaction();
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}
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void rollback()
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{
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_finished = true;
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_db.rollback_transaction(false);
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}
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};
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template <typename Db>
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transaction_t<Db> start_transaction(Db& db, bool report_unfinished_transaction = report_auto_rollback)
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{
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return {db, report_unfinished_transaction};
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}
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template <typename Db>
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transaction_t<Db> start_transaction(Db& db,
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isolation_level isolation,
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bool report_unfinished_transaction = report_auto_rollback)
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{
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return {db, report_unfinished_transaction, isolation};
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}
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} // namespace sqlpp
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